Move #undef DEF_INTERNAL_FN to internal-fn.def

In practice the definition of DEF_INTERNAL_FN is never reused after
including internal-fn.def, so we might as well #undef it there.

This becomes more obvious with a later patch that adds other
DEF_INTERNAL_* directives, such as DEF_INTERNAL_OPTAB_FN.
If the includer doesn't care about the information carried in
these new directives, it can simply leave the macro undefined
and internals.def will provide a definition that forwards to
DEF_INTERNAL_FN.  It doesn't make much sense for includers to have
to #undef macros that are defined by internals.def and it seems overly
complicated to get internals.def to undef macros only in the cases
where it provided a definition.  Instead I went with the approach of
#undeffing all the DEF_INTERNAL_* macros unconditionally.

Tested on x86_64-linux-gnu, aarch64-linux-gnu and arm-linux-gnueabi.

gcc/
	* internal-fn.def: #undef DEF_INTERNAL_FN at the end.
	* internal-fn.c: Don't undef it here.
	* tree-core.h: Likewise.

From-SVN: r229923

gcc/ChangeLog

 2015-11-07  Richard Sandiford  <richard.sandiford@arm.com>
 
+	* internal-fn.def: #undef DEF_INTERNAL_FN at the end.
+	* internal-fn.c: Don't undef it here.
+	* tree-core.h: Likewise.
+
+2015-11-07  Richard Sandiford  <richard.sandiford@arm.com>
+
 	* builtins.c (fold_builtin_nan): Delete.
 	(fold_builtin_memcmp): Remove case where both arguments are constant.
 	(fold_builtin_strcmp, fold_builtin_strncmp): Likewise.

gcc/internal-fn.c

@@ -43,7 +43,6 @@ along with GCC; see the file COPYING3.  If not see
 const char *const internal_fn_name_array[] = {
 #define DEF_INTERNAL_FN(CODE, FLAGS, FNSPEC) #CODE,
 #include "internal-fn.def"
-#undef DEF_INTERNAL_FN
   "<invalid-fn>"
 };
 
@@ -51,7 +50,6 @@ const char *const internal_fn_name_array[] = {
 const int internal_fn_flags_array[] = {
 #define DEF_INTERNAL_FN(CODE, FLAGS, FNSPEC) FLAGS,
 #include "internal-fn.def"
-#undef DEF_INTERNAL_FN
   0
 };
 
@@ -65,7 +63,6 @@ init_internal_fns ()
   if (FNSPEC) internal_fn_fnspec_array[IFN_##CODE] = \
     build_string ((int) sizeof (FNSPEC), FNSPEC ? FNSPEC : "");
 #include "internal-fn.def"
-#undef DEF_INTERNAL_FN
   internal_fn_fnspec_array[IFN_LAST] = 0;
 }
 
@@ -2062,7 +2059,6 @@ expand_GOACC_REDUCTION (gcall *stmt ATTRIBUTE_UNUSED)
 static void (*const internal_fn_expanders[]) (gcall *) = {
 #define DEF_INTERNAL_FN(CODE, FLAGS, FNSPEC) expand_##CODE,
 #include "internal-fn.def"
-#undef DEF_INTERNAL_FN
   0
 };
 

gcc/internal-fn.def

@@ -86,3 +86,5 @@ DEF_INTERNAL_FN (GOACC_LOOP, ECF_PURE | ECF_NOTHROW, NULL)
 
 /* OpenACC reduction abstraction.  See internal-fn.h  for usage.  */
 DEF_INTERNAL_FN (GOACC_REDUCTION, ECF_NOTHROW | ECF_LEAF, NULL)
+
+#undef DEF_INTERNAL_FN

gcc/tree-core.h

@@ -774,7 +774,6 @@ enum annot_expr_kind {
 enum internal_fn {
 #define DEF_INTERNAL_FN(CODE, FLAGS, FNSPEC) IFN_##CODE,
 #include "internal-fn.def"
-#undef DEF_INTERNAL_FN
   IFN_LAST
 };